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Goodwill and Intangible Assets - Estimated Amortization (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 1,787  
2020 1,481  
2021 1,394  
2022 1,375  
2023 1,281  
Thereafter 3,072  
Estimated amortization $ 10,390 $ 12,402